bwidget/tcllib/tcltls: Add libPrefix attributes.

This is what I forgot in the packages I have added a few months ago, so it's
time to revisit them and improve things, like for example set the right
libPrefix in order to stay consistent with other TCL libraries.

In addition this fixes some whitespace ugliness in the affected packages.

Signed-off-by: aszlig <aszlig@redmoonstudios.org>

pkgs/development/libraries/bwidget/default.nix

@@ -12,9 +12,13 @@ stdenv.mkDerivation rec {
   dontBuild = true;
 
   installPhase = ''
-    ensureDir "$out/tcltk"
-    cp -R *.tcl lang images "$out/tcltk/"
+    ensureDir "$out/lib/${passthru.libPrefix}"
+    cp -R *.tcl lang images "$out/lib/${passthru.libPrefix}"
   '';
 
-  buildInputs = [tcl];
+  passthru = {
+    libPrefix = "bwidget${version}";
+  };
+
+  buildInputs = [ tcl ];
 }